如何在L2E查询中表示t-sql convert（datetime，data，style）？

Question

How do I write this query in Linq to Entities:

select convert(datetime,data,103) from Audit where ActionId = 1

Column Data is of varchar(max) type. I know that if the ActionId equals one in a row, than the Data column in the row will always contain a string that represents a date in dd/MM/yyyy format.

Update :

I need to return the result of the L2E query as IQueryable, because paging / sorting is applied on top of it. This is another reason, why I want this field returned as DateTime - to be able to sort on it.

Answer 1

Would it be easier to format on client instead of server?

I would do something like this:

var audits = db.Audit
    .Where(arg => arg.ActionId == 1)
    .Select(arg => new { arg.Data })
    .AsEnumerable()
    .Select(arg => DateTime.ParseExact(arg.Data, "dd/MM/yyyy", CultureInfo.InvariantCulture)
    .ToList();

The data will be retrieved in string format.
After strings are retrieved they will be converted to DateTime .

Answer 2

I've found this: Convert String to Int in EF 4.0 It looks, like this trick might help, if we create a function to cast string into datetime.

UPDATE This problem left unsolved for me. As I needed a quick solution I converted the 'data' column to be of datetime type. This is not generic for future extensions, but it works for now. One of the solutions that are not really a solution.